Vehicle Security System Alarm Operation

WARNING: This page is about a different car, the 2005 Infiniti FX45 and 2005 Infiniti FX35. However, it is still accessible from the selected car via links, so may be relevant.

The vehicle security system is triggered by

Opening a door
Opening the back door
Opening the hood
Detection of battery disconnect and connect.

The vehicle security system will be triggered once the system is in armed phase, When BCM receives a ground signal at terminals 12 (passenger side door), 13 (rear RH door), 58 (back door),62 (driver side door), 63 (rear LH door), or receives a signal from the IPDM E/R (hood switch).

When the vehicle security system is triggered, ground is supplied intermittently from IPDM E/R terminals 38 and 60. When headlamp high relay (with built-in IPDM E/R) and horn relay are energized and then power is supplied to headlamps (LH and RH) and horns (HIGH and LOW).

The headlamps flash and the horn sounds intermittently. The alarm automatically turns off after 50 seconds, but will reactivate if the vehicle is tampered with again.